package com.jiuwan.gamepass.utils;
import com.jiuwan.gamepass.dto.appJson.CommonJson;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;

/**
 * @version 1.0
 * 功能目的描述 ：用于         ========>>>>>>>>>>>
 * @author： pang-yun
 * @date： 2021-06-24 15:10
 */
@Component
public class DownloadUtil {

    public static CommonJson downLoadFromUrl(String urlStr, String savePath) throws IOException {
        URL url = new URL(urlStr);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        //设置超时间为3秒
        conn.setConnectTimeout(60 * 1000);
        //防止屏蔽程序抓取而返回403错误
        conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");

        //得到输入流
        InputStream inputStream = conn.getInputStream();
        //获取自己数组
        byte[] getData = readInputStream(inputStream);

        //文件保存位置
        File saveDir = new File(savePath);
        if (!saveDir.exists()) {
            saveDir.mkdir();
        }
        //截取字符串作为保存文件名称
        String fileName = urlStr.split("-")[1].toString();

        File file = new File(    saveDir + File.separator + fileName);
        FileOutputStream fos = new FileOutputStream(file);
        fos.write(getData);
        if (fos != null) {
            fos.close();
        }
        if (inputStream != null) {
            inputStream.close();
        }

        CommonJson commonJson = new CommonJson();
        commonJson.setCode(MyCode.SUCCESS_CODE);
        commonJson.setMsg(MyCode.SUCCESS_MSG+"  "+"info:" + url + " download success");

        System.out.println("info:" + url + " download success");
        return commonJson;
    }


    /**
     * 从输入流中获取字节数组
     *
     * @param inputStream
     * @return
     * @throws IOException
     */
    public static byte[] readInputStream(InputStream inputStream) throws IOException {
        byte[] buffer = new byte[1024];
        int len = 0;
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        while ((len = inputStream.read(buffer)) != -1) {
            bos.write(buffer, 0, len);
        }
        bos.close();
        return bos.toByteArray();
    }


}